levelzero.h
/*
* Copyright © 2021 Inria. All rights reserved.
* See COPYING in top-level directory.
*/
#ifndef HWLOC_LEVELZERO_H
#define HWLOC_LEVELZERO_H
#include "hwloc.h"
#include "hwloc/autogen/config.h"
#include "hwloc/helper.h"
#ifdef HWLOC_LINUX_SYS
#include "hwloc/linux.h"
#endif
#include <level_zero/ze_api.h>
#include <level_zero/zes_api.h>
#ifdef __cplusplus
extern "C" {
#endif
static __hwloc_inline int
hwloc_levelzero_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
ze_device_handle_t device, hwloc_cpuset_t set)
{
#ifdef HWLOC_LINUX_SYS
/* If we're on Linux, use the sysfs mechanism to get the local cpus */
#define HWLOC_LEVELZERO_DEVICE_SYSFS_PATH_MAX 128
char path[HWLOC_LEVELZERO_DEVICE_SYSFS_PATH_MAX];
zes_pci_properties_t pci;
zes_device_handle_t sdevice = device;
ze_result_t res;
if (!hwloc_topology_is_thissystem(topology)) {
errno = EINVAL;
return -1;
}
res = zesDevicePciGetProperties(sdevice, &pci);
if (res != ZE_RESULT_SUCCESS) {
errno = EINVAL;
return -1;
}
sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/local_cpus",
pci.address.domain, pci.address.bus, pci.address.device, pci.address.function);
if (hwloc_linux_read_path_as_cpumask(path, set) < 0
|| hwloc_bitmap_iszero(set))
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#else
/* Non-Linux systems simply get a full cpuset */
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#endif
return 0;
}
static __hwloc_inline hwloc_obj_t
hwloc_levelzero_get_device_osdev(hwloc_topology_t topology, ze_device_handle_t device)
{
zes_device_handle_t sdevice = device;
zes_pci_properties_t pci;
ze_result_t res;
hwloc_obj_t osdev;
if (!hwloc_topology_is_thissystem(topology)) {
errno = EINVAL;
return NULL;
}
res = zesDevicePciGetProperties(sdevice, &pci);
if (res != ZE_RESULT_SUCCESS) {
/* L0 was likely initialized without sysman, don't bother */
errno = EINVAL;
return NULL;
}
osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
hwloc_obj_t pcidev = osdev->parent;
if (strncmp(osdev->name, "ze", 2))
continue;
if (pcidev
&& pcidev->type == HWLOC_OBJ_PCI_DEVICE
&& pcidev->attr->pcidev.domain == pci.address.domain
&& pcidev->attr->pcidev.bus == pci.address.bus
&& pcidev->attr->pcidev.dev == pci.address.device
&& pcidev->attr->pcidev.func == pci.address.function)
return osdev;
/* FIXME: when we'll have serialnumber, try it in case PCI is filtered-out */
}
return NULL;
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* HWLOC_LEVELZERO_H */
hwloc_cpuset_t
hwloc_bitmap_t hwloc_cpuset_t
A CPU set is a bitmap whose bits are set according to CPU physical OS indexes.
Definition: hwloc.h:140
HWLOC_OBJ_PCI_DEVICE
@ HWLOC_OBJ_PCI_DEVICE
PCI device (filtered out by default).
Definition: hwloc.h:269
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:692
hwloc_topology_is_thissystem
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
hwloc_topology_get_complete_cpuset
hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
hwloc_get_next_osdev
static hwloc_obj_t hwloc_get_next_osdev(hwloc_topology_t topology, hwloc_obj_t prev)
Get the next OS device in the system.
Definition: helper.h:1194
hwloc_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
hwloc_bitmap_copy
int hwloc_bitmap_copy(hwloc_bitmap_t dst, hwloc_const_bitmap_t src)
Copy the contents of bitmap src into the already allocated bitmap dst.
hwloc_linux_read_path_as_cpumask
int hwloc_linux_read_path_as_cpumask(const char *path, hwloc_bitmap_t set)
Convert a linux kernel cpumask file path into a hwloc bitmap set.
hwloc_levelzero_get_device_cpuset
static int hwloc_levelzero_get_device_cpuset(hwloc_topology_t topology, ze_device_handle_t device, hwloc_cpuset_t set)
Get the CPU set of logical processors that are physically close to the Level Zero device device.
Definition: levelzero.h:60
hwloc_levelzero_get_device_osdev
static hwloc_obj_t hwloc_levelzero_get_device_osdev(hwloc_topology_t topology, ze_device_handle_t device)
Get the hwloc OS device object corresponding to Level Zero device device.
Definition: levelzero.h:109
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:396
hwloc_obj::name
char * name
Object-specific name if any. Mostly used for identifying OS devices and Misc objects where a name str...
Definition: hwloc.h:408
hwloc_obj::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:398
hwloc_obj::attr
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:415
hwloc_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (Machine object)
Definition: hwloc.h:446
hwloc_obj_attr_u::pcidev
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
hwloc_obj_attr_u::hwloc_pcidev_attr_s::dev
unsigned char dev
Definition: hwloc.h:639
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Definition: hwloc.h:639
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Definition: hwloc.h:635
hwloc_obj_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Definition: hwloc.h:639